• 
  Colbert Clark

  regizor

• 
  Albert Herman

  scenarist
• 
  Colbert Clark

  scenarist
• 
  Norman S. Hall

  scenarist

• 
  Bela Lugosi

  Profesor Anton Strang
• 
  Malcolm McGregor

  Jack Foster
• 
  Viva Tattersall

  Vera Strang
• 
  George J. Lewis

  Bud Foster

• 
  Henry B. Walthall

  J.D. Bradley
• 
  Robert Warwick

  Detectiv Robert Raymond
• 
  Roy D'Arcy

  Profesor Alexis Steinbeck
• 
  Karl Dane

  Sparks
• 
  Lloyd Whitlock

  Young
• 
  Bob Kortman

  Jasper Slade
• 
  Lafe McKee

  Dul Jerome

• 
  Kernan Cripps

  Driver Murphy [Chs. 1,8]
• 
  Robert Frazer

  Official

• 
  Nat Levine

  producător
• 
  Edgar Lyons

  imagine
• 
  Ray Snyder

  machiaj
• 
  Lee Zahler

  coloană sonoră